Spindle-lock for micrometer-gages.



L. s. STARRETT. SHNDLB LOCK FOR MIGEOMETER GAGES. AAAAAAAAAAAAAAAAAAAAAAAA 9.-

928389. Y Patented July 20,1909.

Vlfirmssszs I IVA/727A UNITED STATES PATENT OFFICE;

LAROY s. STARRETT, or ATHOL, MASSACHUSETTS, AssIcN'oR TO THE .L. s. STARRETT/GQ,

OF ATHOL, MASSACHUSETTS, A CORPORATION DI -MASSACHUSETTS, I

- nozoasnse. 7

- SPINDLE-LOGK FOR- monomrnncnens.

Patented July 20, 1909.

To all whom it may concern: 1

Be it known that I, LAROY S. STARRETT, of Athol, in the .county of Worcester and 'State of Massachusetts, have invented certain new and useful Improvements in Spindle-Locks for Micrometer-Gages, &c., of

which the following is a specification.

- -This invention relates to the class of spino 1 die locking devices in which the bearing or iw'tool-head surrounding the 1 rotary spindle has a deep transverse slot to receive, edge- "vise, a lock-actuating ring and an inc'losed spindle clamp having, in a flat-bottomed pejg ripheral recess of decreasing depth, a minute .ljfi 'locking roller, movable by. partial rotation M of the actuating ring to lock and to unlock locking roller always into contact with the inner wall of the actuatin ring, and it ob viates the necessity ofhar ening-the locking clamp, 'to prevent its becoming indented by the roll. A further improvement consists .in holding the clam ingyring from turning, byintroducin ,t rough a threade'dperforation in the too -head or bushing, a screw, the pointed tip of which enters a notch or groove 40 in the ed e wall of the clamp.

In the rawing, Figure 1 1s a side view of a micrometer gageembodying my invention. Fig. 2 is a transverse section, four timesenlarged, taken through the'tool-head on line 4 '2 -2 of Fig. 1,:a idjF-ig. 3 an axial section thereof on sameTj-scale, on line 3 3 of Fig. 2,'the spindleand holding screw in elevation.

Fig. 4 is a side'aview of the clamping ring,

simi lar;lyj iar grad, and Fig. 5 a'plan .of-the a s 'flug'." "1 I r The tool to which my improvement is applied will be of any usual construction,- with a bearing or tool-head7, in whlch the spindle 8 is rotatable. The tool-head has a deep inwardtyx ,cess'. The spring thus arranged lifts the transverse slot 9 formed in it to receive, edgewise, when the spindle is withdrawn, the lock actuating ring 10 and the severed annular clamp 11 within it, together with the spring and roller located between them.

The distinctive characteristics of the clamp construction will be explained in detail with referencejso the enlarged. drawings.

Clamping rin ll is transversely severed at 12 and forms with a cam-like peripheral recess 13 the floor of which is convex to form a bed'for the thin flat spring 14 which is pinched at one end between the walls of a slot 15, Fig. 4:. The free 1 portion of the spring is held down on a curve eccentric to the ring l0,'by the roller-16 in the deepest part of recess 13. The roller is thus lifted and kept elasticall in contact with the actuating ring at al times, and the slightest rotation of the rin in the proper direction, carries the roller orward toward the shallower art of the recess, presses the spring and compresses the adjacent free arm'of e clamp upon the spindle, looking it instantly. The reverse movement asspeedily releases it, see Fig; 2. v

*In order to secure the clamping ring against any rotary movement I form-in its side or edge a notch or groove 18, Figs. 2 8

and 4, in position .to receive the ti portion of. a screw 17, threaded into and ush with the end .portion of the bushing or tool head 7, see Flg. 3'. This device materially simplifi'es the holding means heretofore adopted, and makes a much nicer finished tool than has hitherto been produced." The groove 18 permits the recessed. part of the clamp to yield more readily to lock upon the spindle. The flat spring 14 would. extend normally' 1n the general direction of slot in which its end is secured, but isdeflected into the recess 13 in assembling .the parts and held by the roller 16 and rin 10. Hence the curvature shown for the ottomof said recess ising epthfa flattened spring and a locking piece in such recess an an actuating ring rotatable about said clamp.

2. The bearing hr tool-head for ned with a deep transverse siOt a11d the rotatable spindle located axially in such head, in conibination with a severed clamping ring having av cam-like peripheral recess, a flattened spring held by one end therein and a roller pressing inwardly the free end of the spring,

and with a rotatable actuating ring inclo's- 111g said locking parts.

d. The bearing or tool-head formed with a deep transverse'slot, the rotatable spindle located axially in such head, and the lockactuating ring rotatable in said slot, in combination with an annular clamp having a marginal groove, a peripheral recess of'decreasing depth, a locking roller insuch rem-- and with a holding screw in the toolhcad fornied with a reduced tip" engaging" thegroove in said clam lVitnesses I FLORENCE E. BOYCE, \FRAN-K E. ING,

LAROY is. sTARRE'r'T. f 

